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pQ-y III IIIIIIIIIIIII III <br />PEABODY COAL COMPANY <br />Western Dlvislon <br />1300 South Vale <br />Flagstaff, Arizona 86001 <br />(602) 77x5253 <br /> <br />J;;N 1 7 ~oq+ <br />fl~l(ned Land <br />Reclamation Division <br />January 15, 1991 <br />Mr. Carl Mount <br />Colorado Mined Land Reclamation Div. <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />RE: Permit C-82-057, Seneca II-W Mine, TR No. 10 <br />Dear Mr. Mount: <br />Enclosed please find three copies of an application for a Technical <br />Revision to the Seneca II-W permit application package. <br />Peabody proposes to modify Sedimentation Pond 006 to increase the <br />capacity of the ponding area. A 24" drop inlet riser pipe containing <br />a 4" diameter orifice will be attached to the existing 24" CMP <br />spillway. A design report for Pond 006 has been produced to ensure <br />that the new spillway configuration complies with the Division's <br />regulations and Peabody's approved permit. <br />The existing Pond 006 - Phase I is still in compliance and functioning <br />as designed. The slide did slightly decrease the capacity, but only by <br />0.8 Ac-ft (11.4 Ac-ft compared to 10.6 Ac-ft) at the principal spillway <br />(elevation 7065). The current disturbance from mining activities, <br />approximately 240 acres within the 006 watershed, is less than the <br />maximum disturbance of 277 acres in the Phase I design. <br />